I prefer a 22 inch Smitty on my 62 1/2 ton Chevy truck with a 235 c.i. engine. I don't like looking over my shoulder wondering if the local Law Enforcement Folks are going to pull me over. I have always heard that a straight exhaust was hard on the valves?? The best sound for an old stovebolt is a split manifold with two Smitties!!